A Survey of Symmetric Searchable Encryption in Cloud Environment

The technology of cloud storage is an effective way to solve the problems in high-capacity data storage, interaction and management. Using encrypted data in cloud servers is an important means to protect the privacy and security of user data in remote servers. Searchable encryption technology can improve the system availability on the premise of ensuring the security of user data. For its search efficiency, the Symmetric Searchable Encryption (SSE) has become a hot research topic. In general, the related research can be summarized into three aspects: the system model, efficiency and security, and usability. Firstly, the typical models of Symmetric Searchable Encryption(SSE) system are introduced. Then, common methods for search efficiency optimisation and security analysis are analysed in depth in this paper. Finally, from the aspects of scene adaptability, sentence expression ability and query result optimization, the research on scheme usability is combed and the hot spots and difficulties of the current research are summarized. On this basis, the possible research hotspots in the future are further analyzed.